Rotary gas-engine.



H. I. WILBER.

ROTARY GAS ENGINE.

APPLICATION nun JULY 1a, 1009.

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Patented 00:. 25, 1910.,-

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I Jicfberbl Wilben by H. I. WILBER.

' ROTARY GAS ENGINE. APPLIOA'I'IOI rum JUL! 1-0, 1900.

Patented 0ct.25,1910.

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ROTARY GAS ENGINE.

APILIOATION TILED JULY 18,1909.

973,833. Patented 001;. 25, 1910.

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H. I. WILBER.

ROTARY GAS ENGINE.

nrmouzo! rnnn Jun 16,1990.

973,833. Patented Oct. 25, 1910.

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H. I. WILBER.

ROTARY GAS ENGINE.

APYLIOATIOI rnnn JULY 10,1000.

973,833. 3 Patnted 0012.25, 1910.

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as as m a 3 a I is I H. I. WILBER. I noun us ENGINE. v LPPLIUATIOI FILED JUL Y16,1909. 973,833. Patented Oct. 25, 1910.

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UNITED STATES PATENT OFFICE.

ROTARY ens-Enema.

Specification 0! Letters Patent.

Patented Oct. 25, 1910.

Application filed July 16, 1909. Serial No. 508,063.

To all whom 'it may concern:

Be it known that I, HERBERT I. VVILBER, a citizen of the United States of America, and a resident of'Dorchester, in thecount-y of Sufi'olk and State of Massachusetts, have invented certain new and useful Improvements in Rotary- Gas-Engines, of'which the following is a specification.

This invent-ion"'relates to rotary as engines and has for its objectthe pr uction of a deviceof this class which willbe eco-' nomical in itsoperation while simple in construction.

- It consists in'an engine provided witha plurality of piston chambers, each of which 1113 a separate compression chamber adapted to communicate -with its own piston chamber, to be cut of t-herefrom, or to be placed in communication with another 'piston chamber during the various revolutions of the piston. g

Itconsists in a device of this class in which a valved assage connects a' plurality of piston cham rs, the valves of which'are operated to .permit a charge in one piston chamber to be compressed by the actionof the explosion behind said piston and after such compression to be transferred into another piston chamber and confined therein until the explosion therein takes place.

It consists further in a device of this class in which a plurality of piston chambers are used, soconstructed and operated that a greater number of explosions occurin one piston chamber than in another.

It consists further'in a novel construction of piston blade and means for operating it.

It consists further in certain novel features of construction and arrangement of parts which will bereadily understood by reference to the description of the drawings and to the claims hereinafter given. Of the drawings: Figure 1 represents an elevation of an engine embodying the features of the present invention. Fig. 2 represents a plan of the same. Fig. 3 represents a transverse'section of the same, the cutting plane-being on line 33 on Fig. 2-, lookingin the direction of the arrow. Fig. 4 represents a vertical section of the same, the cutting plane being on line 4.- 4 on Fig. 3, looking in the direction of 'thearrow. Fig.

represents a vertical section of a portiomotthe same, the cutting plane being endine' 5-5 on Fig. 3.. Fig. 6 represents a side. view of the compositeblade and-supporting member. Fig. Trepresents an end view of the same. Fig. 8 represents a section through the blade, the cutting plane being view of the outer contacting, face oflthe blade. Fig. 10 represents an elevation of one pair of oscillating packing members for said composite blade. Fig. 11 represents an end view of one of said members. Fig. 12 represents a view of the opposite end of said member. Fig. 13 represents a vertical section of the engine, the cuttingplane being on line 13-13 on Fig. 2. Fig. 14 represents a' section through the inlet pipe and valves, the cutting lplane being on line 1414 on Fig. 3, and i 15 to 24 inclusive represent diagrams of t e various cam members for operating the valves.

Similar characters throughout the several figures of the drawings.

In the drawings, 10 represents a casing supported by means of feet 11. The casing chambers 12 and 13, these piston chambers passage 14 and outlet passage 15, at which point-each piston chamber is provided with cry of the revoluble pistons 16 and 16*. se-. cured to and revoluble with a shaft.17 eccentrically mounted within said pistonv chambers 12 and 13 and having bearings bolts to the casing 10. I

The casing 10 is rovided with a suitable water acket t rough which water is adapte to circulate to keep the casing The shaft 17 isprovided with a passage 21 non-revoluble sleeve 23-mounted upon one connected by a pipe 25; to apump 25 driven by the-gears 2fig-and 27 by the rotation of said shaft 17.

pump 25 and when the pump is in operation" a water is forced into the chamber 22, thence through the passa 21 into the water. paspassage 29 also communicating through the passage 30 in the shaft 17 to a similar water passage 29 in the other piston 16";

being cylindrical except between the inlet sage 29 in one of t e pistons 16, said water on line 88 on Fig. 6. Fig; 9 represents a designate like parts 10 1s p'rovidedwith a plurality of piston a depression accurately fitting the periph- 18in the end plates 19 securedby suitable cooled during the. operation of the engine.

which communicates with a chamber 22 in a end-of-the shaft '17, which chamber 22 is,

A water pipe 28 communicates with said -A passage 31 in the shaft 17 communi-' i cates with the water passage 29 in said pisan annular ton 16* for the water being f means of the pump 25 through thepassa ges in said pistons and shaft; thus keeping the pistons and shaft 0001 during the operation of the engine.

The inner faces of the end plates 19 and the division wall 32 between the iston chambers 12 and 13 are each provid with roove concentric with the main portion of tdiewall of the piston chambers 12 and 13 and in each of these grooves is mounted a ring 33, eachring 33 ing provided with an extension 34 projecting toward each other in air s.- These extensions 34 are each provided with a flange 35 adaptedto enter a groove in the inner end of the blade 36 or 36*, said blade provided,

in grooves in either end face,-:w1th the con; tacting members 37 forcei outwagrdly by means of the springs 38 into .contact: with the inner wall of the end plates 19 and division wall 32. 7

Each of the end members 37 is- 15rovided at its outer end with inwardly extending projections 39 which overlap each-other in oove formed in the outer end of the blade 36 or 36*. Between the extensions 34 and the blade 36 or 36* are springs 40 adapted to force the outer ends of the overlapping projections 39 into contact with the wall of the piston chambers 12 or 13 during the rotation of the pistons 16 and 16* therein.

This com osite blade formed of different members oreed outwardly into contact with the opposing walls of the piston chamber by means of springs,vwith the various members overlapping one another, provides an effective means of acking the joints between said chamber-wall; and the piston blade duri the operation ofthe engine.-

ithin the ofi-ea'c h' piston 16 and 16* is a depression 41' in which the blade 36 or 36* is adapted 'to operate. Portions of the side walls of thisdepression are made 0 lindrical to-,--receive .the divided semi-eyh'nd ric'al. packing members a 42,; the

flat face'of whi'ch bearsfagainst "the side walls of said at-king member 36-36*\and I forms a suite le guide therefor which adapted to oscillate during the rotation of;

the eccentrie pistons 1616*, this permit ting'the-blade 3H6. to always remain, ra-

dial to the central. axis-of the piston cham-' bers 12 all (1 13 while thepiston 16 is mmtile abbutthe axis-of the shaft 17 eccentric "to th'e'axis-of said piston chambers.

' A pinion 43'mounted upon the shaft 17 mesheswith a gear' 44 .revolublc about a fixed stud 45 secured to one of the end lates 19. This gear 44 is provided with a vel gear 46 which meshes with a similar bevel gear 47 secured in and revoluble with a shaft 48 mounted in bearings 49 project- 'ing' fromoneend of the-engine.

A bevel gear50 secured to' the upper end of said shaft 49 meshes with a similar gear 51 mounted upon a shaft 52 in bearings 53 on the upper end of the cas' 10, 'said shaft 52 being parallel with the piston shaft 17. Between the bearings 53 upon the shaft 52 are mounted a plurality of cam members 53*, 54,v 55, 56, 57, 59, 60, c2, 63, and 66.

Secured to the casing-1,0 are brackets 63* supportin a rod 64on which are mounted the cylin rical hubs 65 and 66*, said hubs 65 and 66* being'provided respectively with arms 67 and 69 the free end of each of which is rovided with an anti-friction member which is engaged respectively by the cam members 54 and 55 to causes!) oscillation of said cylindrical hubs 65 and 66* during the rotation of the cam shaft 52.

The hi1b65 is provided with an arm 70- 'which' engages with the stem 71 of an inlet valve 72, said valve being normally closed by means of the spring 73 and opened whenever the projection upon .the cam member 54 causes an oscillation of the'hnb 65 about the rod 64. In a similar manner the hub 66* is provided with {warm which engages with the valve stem of a valve 76' which is adapted to be'operated by means of the cam member 55 to admit the motive agent to the piston chamber 13 from the inlet pipe 77, which-also supplies the motive agent to the piston-chamber 12 when the valve? 2 is open.

In the casing 10 and just in advance of the inlet valves 72 and 76 are the spark plugs 78 and 78* of any well-known construction. On the opposite side of the engine, in brackets 79 secured'to the casing 10 is a rod 79* on which are mounted semi-cylindrical hubs 80 and 81, these hubs 80. and 81 being provided-with arms 82 and 83, the free ends of which are provided with anti-friction "memberswhich engage respectively with the cam members 56 and 57 secured to and rev oluble with the cam shaft 52. I v The hub 80 is provided with-an arm 84 engaging with the valve stem 85 of an exhaust.

'valve 86 normallv retained in closed positionby means of the spring 87 and adapted to be opened during the operation of theengine by the action of the cam projection upon the cam member :itiwhenin the rota- 10!! of the cam shaft- 52 such pro ection causes an oscillation of the hub 80 about the rod 79.

The huln81 is similarly provided with an arm 88 engaging with thevalve stem 89 of the exhaust valve 90 normally closed by means of the spring 91 and adapted'to be opened by the cam projections upon the cam member 57 to permit of an exhaust from the piston hamber 13 through the exhaust pipe 92, the valve 86 when opened permitting an exhaust from the piston chamber 12 through the same exhaust pipe 92.

The inlet'valves 72 and 7fi'each coinmunicate through the inlet passage 14 with the piston chambers 12 and 13 while the exhaust while the exhaust passage 15 from the piston chamber 13 is provided with a valve 94, these valves 93 and 94 both opening into a chamber 95 in the casing 10, permitting a communication between the piston chambers 12 and 13 whenever the valves 93 and 94 are opened.

The valve 93 is normally retained in closed position by the spring 96 and is opened by the lever 97 when operated by means of the cam projection upon the cam member 53" during the rotation of the cam shaft 52. The valve 94 is similarly normally retained in closed position by means of a spring 98 and is opened by the oscillation of the lever 99 when actuated by the cam prO ections upon the cam member 59 mounted upon the revoluble cam shaft52.

A valve 100 surroundin the stem of the valve 93 and normally retamed in closed po-' sition by means of the spring 101 is adapt-ed to be opened by the oscillation of the lever 102 when actuated by the cam projections on the cam member-60 secured to and revoluble with the cam shaft 52, this opening of the valve 100 providing a communication between the chamber 95 and the compression chamber 103 for the piston chamber 12.

.. A similar valve 104 .surrounding the valve stem of the valve 94 is normally retained in closed position by means of a spring 105 sage 14. Similarly a valve 110 normally and is opened by the oscillation of a lever 106 when said lever is-actuated by the cam projections upon the cam member 66 secured to and revoluble with the camshaft 52, this opening of the valve 104 providing a communication. between the chamber 95 and the compression chamber 103* for the piston chamber 13. A valve 107 normally closed by means of a spring 108 is adapted,

when thus closed,'-to shut off communication" between the compression chamber 103- and the inlet passage 14 of the piston chamber 12, but said valve 107 may be 0 ned by the movement of the lever 109 w enever said lever is actuated by the cam projections on the cam member 62 to, emit the contents of the compression cham r 103 to pass into the piston chamber 12 through the inlet pasclosed by a spring 111 is adapted to be 0 ned by the oscillation of the lever 112 when actuated by the cam projections upon the cam member 63 mounted upon the cam shaft 52 to permit the contents of the compression chamber 103" to passinto the piston chamber 13 through the inlet passage 14.

The cooling medium is admitted to the spring 115 which bears against the other packing member to separate the same to take up the wear and always retain the ends of these members against the walls of the piston chambers.

In the position of the various parts as shown in Figs. 3 and 13 of the drawings a charge is supposed to have just been admitted through the valve 72 1n advance'of the blade 36 in the piston chamber or cylinder 12 and'the valve 107 has just been opened to permit a compressed charge within the chamber 103 to be admitted behind the blade 36. At this time the inlet valve 76 to the piston chamber or cylinder 13 is open and the explosive mixture is being admitted through the same into said piston chamber 13 and the valve 94 is open admitting the charge in front of the blade 36* to the compartment 95. All of the other valves communicating with the piston chamber 13 are closed as is shown in Fig. 13 of the drawings and the valve 94 closes when the blade 36* reaches the point A.

While the various valves and pistons are in this osition (with the blade 36 at E) the spark p ug 78 in the chamber 12 is operated to cause an explosion of the explosive mixture' behind the blade 36 in said chamber 12 and in the compression chamber 103 and passage 14-between said compression chamber 103 and said piston chamber '12, this explosion driving the piston ahead about the axis of the shaft 17 in the direction of the arrow indicated on Fig. 3 of the drawings.

By the movement of the blade 36 the charge in the piston chamber 12 in advance of said blade 36 is compressed, the valves 86 and ,93- being closed until the blade 36 reaches the point F. When the blade 36 reaches the point F the valves 93 and 104 are opened by the cam throws upon their respective operating cams, thus opening up communication bet-ween'the piston chamber 12 and the compression chamber 103* of the piston chamber 13.

The charge contained within the piston chamber 12 in advance of the blade 36 vis thus permitted to pass through the exhaust passage 15 and through the chamber 95. The continued rotation of the piston 16 with its blade 36 will cause the charge in advance thereof and that within the chamber 95 and the compression chamber 103* of the piston chamber 13 to be further com .pressed until the blade 36 reaches the point A, when the valve 93 will be closed and the exhaust valve 86 will be opened, thus permitting that portion of the charge between the blade 36 and the valve 03 in the piston chamber 12 to be carried away through the exhaust pipe 92. In the meantime the inlet valve 76 of the piston chamber 13 having been open, the movement of the blade 36" in the piston 16* about the axis of the shaft 17 has drawn in a fresh charge from the inlet pipe 77 in advance of the blade 36*, which blade in the revolution of the piston 16* will cause a compression of this charge in a similar manner in which the charge in the piston chamber 12 is compressed.

Vhen the blade 36* in the piston chamber 13 reaches the point D the valve 110 will be opened, permitting the compressed charge within the compression chamber 103* of the piston chamber 13 to pass into said piston chamber in and when the blade 36* reaches a point E in said piston chamber the spark plug 78* thereof will cause an explosion and continue the rotation ofthe piston in the direction of the arrow indicated on Fig. 13 of the drawing.

\Vhen the blade 36 reaches the point B the valve 100 is opened and the burnt charge in the chamber '95 is driven out through the compression chamber 103- and passage 14 into the piston chamber 12 in advance of the blade 36 to be discharged therefrom through the exhaust valve 86. When the blade 36 reachesthe point C the valve 107 is closed, shutting off further communication between the compression chamber 103 and the piston chamber 12.

When the blade 36 in the o ned opening up conununicatio'n between he. compression chamber 103 and said piston chamber 12, the rotation of the piston in the piston chamber 13 having compressed a charge in said piston chamber and forced it into the compression chamber 103 prior to the opening of this valve 107 and the valve 94 having been closed when the blade 36* reaches the )int F.

When the bla e 36 in the piston chamber 12 reaches the. point E again at' the commencement of the second revolution the valve 100 again closes and the spark plug 78 of that piston chamber operates to cause a second explosion in the piston chamber 12 and as the valve 86 is still open the cylinder or piston chamber is cleared of exhaust. In the meantime the valve 94 closes when the blade 36* in the piston chamber 13 reaches the point A and at the same time the exhaust valve 90 opens. When'the blade 36* the valve 104 opens and a little later when this same blade reaches the point C the valve 110 closes, prior to the closing of which valve 110 the compression chamber 103* is cleared from the burnt gases contained therein.

. When the blade 36* reaches the point D the rear of the blade 36* ton chamber 13 reaches the iston chamber- 12 reaches the point D the va ve 107 is again the inlet valve 7 5 opens into the piston clunnber 13 and admits a new charge behmd said blade 36?, the valve 104 closmg as as the blade has reachedthe point The pistons continue to revolve and when the. blade 36 in the chamber 12 reaches the point .B the valve 100 opens and as soon as this same blade reaches the point C the valve 107 closes preparatory to receiving another charge in the compression chamber 103. When the blade 36 of the piston chamber 12 reaches the point D the inlet valve 72 opens and 'a new charge'is admitted to the piston chamber 12.

At the commence 'ent of the third revolution when the blade 36 in the chamber 12.

reaches the point E the valve 100 again closes and a charge is drawn in to the piston chamber 12. When the blade 36* in the pisoint A near the commencement of the third revolution the valve 90 closes, and as the valve 104 is still open any charge in advance of the blade is forced into the compression chamber 103 of the piston chamber 12. the valve 94 being opened when the blade 36* reaches the point F, while as the valve 76 still remains open a fresh charge is being drawn into the piston chamber 12 behind the blade 36. 4

When "he blade 36 of the piston chamber 12 reaches the point A the exhaust valve 86 closes and the mlet valve 72 also closes, the valve 100 subsequently opening when the blade 36 reaches the point B, opening up communication between the compartment or chamber 95 and the compression chamber.

When the blade 36 in the piston chamber 12 reaches the point D the valve 107 again opens permitting the compressed charge confined in the compression chamber 103 to pass through the inlet passage 14 behind the blade 36 so that when the blade reaches the point E an explosion can take place and the whole operation as described be repeated. It is obvious therefore that in the first revolution of the pistons two explosions takeplace, one at the commencement of the first cycle in the piston chamber 12, and the second explosion at the commencement of the second cycle in the piston chamber 13, while at the commencement of-the third cycle or the sec ond revolution a second explosion occurs in the piston chamber 12. By the operation of the device the charge is readily compressed in one piston chamber and forced into the compression chamber of the other piston chamber preparatory for admission into that piston chamber in the rear of the blade of its respective piston at the proper time for the explosion to take place. Provision is also made to clear burnt'gases from the various piston chambers and from the compression chambers before fresh The blade 36 may be made up as shown in Fig. 4 of the drawings and as heretofore described, or as shown in Figs.,,6, 7', and 8 of the drawings, in which the'member 108 is secured to the extensions 34 of the ring 33 by means of screws 109; The member 108 has a groove cut len thwise thereof in which is positioned a leaf spring 110 bearing against the extensions 39 of the side plates 37', the purpose of this spring being to retain the outer face of the member39 always in contact wi'th'the wall of the cylinder.

In practice in order to have the engine perfectly balanced four piston chambers are usually used, the construction shown in the drawings being duplicated and the explo arranged to occur at 4th, 5th, and 6th sions in one set bein the commencement 0 the cycles of the engine, a

It is believed that the o eration of the invention will be fully on erstood from the foregoing.

Having thus described my invention, I claim: a r

' 1.'In a device of the class described, the combination of two cylinders; a piston in each; a compression chamber for each cylinder; a valve between each chamber and its cylinder; a valved passage between said cylinders; a valve between each com ression chamberand said passage; a revolub e shaft; and a lurality of cams thereon for operating sai valves.

2. In a device of the class described, the combination of two cylinders; a piston in each; a compression chamber for'each cylinder; avalve between each chamber and its cylinder; a valved passage between said cylinders; a valve between each compression chamber and said passage; an inlet valve; an exhaust valve; a rev'oluble shaft; and cams on said revoluble shaft for operating said valves.

3. In a device of the class described, the

combination of two cylinders; a piston in each; a passage connecting said cyllnders; a

valve between said passage and each cylinder; a compression cham er for each cylinder; and outlet valve from each chamber to its cylinder; an inlet valve to each chamber from said passage; and means for operating said valves to permit compressing alternately in each cylinder and'then admitting combination of two cylinders; a

the compressed mixture to the compression chamber of the opposite cylinder;

4. In a device of the class described, the

piston in each; a passage connecting said cylinders; a

valve between said passa e and each cylinder; a compression cham er for each cylinder; an outlet valve'from each chamber to its cylinder; an inlet valveto each chamber from said passage; means for operating a valve between said cylinder and passage when the piston has reached a predetermined point; means for openi the inlet valve to the com ression cham other cylinder; an means for operating the outlet valve of said compression chamber of the other cylinder at a redetermined time and admitting to said cy inder a compressed charge.

5. In a device of the class described, the combination of two cylinders; a piston in each; a passage connecting said cylinders; a valve between said passage and each cylinder; a compression chamber for each cylinder; an outlet valve from each chamber to its cylinder; an inlet valveto each chamber from said passage; means for operating. a valve between said cylinder and passage 1 when the piston has reached a. predeter-' mined point; means for'openin the inlet valve to the compression chamber of the other cylinder; means for operatin the outlet valve of said compression-cham r of the other cylinder at a predetermined time; and

means for exploding the compressed charge thus admitted.

6. In a device of the class described, the combination oftwo cylinders; a piston in each-;-a passage connecting said cylinders; a valve between said passage and each cylinder; acompression chamber for each cylinder; an outlet valve from each chamber to its cylinder; an inlet valveto each chamber, from said passage; means .for operating a valve between said cylinder and passage when the piston has reached a predetermined point; means for opening the inlet valve to the compression chamber of the other cylinder; means for operating the'outlet valve of said compression chamber of the other cylinder at a predetermined time; means for exploding the compressed char e thus admitted; and means for opening t e exhaust valve from said cylinder when the piston blade reaches the passage thereto.

7 In a device of the class described, thecombination of two cylinders; istonstherein oppositely disposed; means or admitting a fresh charge in advance of one of the pistons; a compressed explosive mixture behind said pistons; means for exploding'said compressed charge and thereby revolvin the piston and effecting a compression of the fresh charge in advance thereof means for admitting the charge thus compressed to the other cylinder'behindits piston; means r of the.

for admitting a fresh charge into the other inder;'and means for explodingsaid compressed charge,

8. In adevice of the class described, the

a the combinatiolli 05 two linders; istogntherein op 'te ispose means or a itting a in advance of one of the pistons; a compressed explosive mixture 'behind said istons; means for exploding said comp charge and thereby revolving iston and efiecting'a compression of the resh charge in advance thereof; means for admi the charge thus compressed to the other cy mder behind its I iston; means for admitting a fresh charge mto the other cylinder ahead of said piston; means for ex loding the compressed charge in the other cy inder and causing the compression of the fresh charge therein ahead of said piston; means for admitting said charge thus compressed into the first-mentioned cylinder; means for ex loding said compressed charge; anduneans or successively scavenging the cylinders aftcr the explosions have occurred.

9. In a device of the class described, the combination of two cylinders; pistons therein oppositely dis 1; a coi-npression chamber for each cylinder; means for admitting a' fresh charge into one of said cylinders in advance of its piston; means for admitting from its compression chamber a com resse char behind said'piston; means or exploding said compressed char and there- )y revolvin the piston and'e ecting a compression o the fresh charge in advance thereof; means for admitting afresh charge into the other c \-'linder in advance of its piston; means for admitting the compressed charge in the first-mentioned cylinder into the compression chamber of the other cylinder; ,means for admitting the compressed charge in said chamber to the other cylinder behind its iston; means for exploding said comp charge in the other cylinder and thereby compressing the charge in front of its piston; means for admitting thecharge thus compressed into the first-mentioned compression chamber; means for .admitting said co'm ressed charge into the first-mentioned cy inder behind its piston and means for exploding this charge.

10. Ina device of the class described, the

combination of two linders; pistons therein oppositely I wa compression chamber for each cyhnder; means for admitting a fresh charge into one. of said cylinders in advanceof its piston; means for admittin from its compression chamber a com resse charge behind said piston; means or explodmg said comprwsed char and thereby revolvlng thepiston and e ecting a compression of the fresh charge in advance thereof; means for admitting a fresh charge into the other cylinder in advance of its piston; means for admittingthe com'ipressed charge in the first-mentioned cylin er into the comprwion chamber of'the other cyl inder; means for admitting the compressed charge in said chamber to the other cylinder behind'its iston; means for exploding said compresse charge in the other cylinder and thereby compressing the charge in front of its piston; means for admitting-the charge thus compressed into the first-mentionedcompression chamber; means for admitting said i compressed charge into the first-mentloned c linder behind its piston; means for exp oding this charge; and means for successively scaven g .the cylinders and compression cham rs after the explosions have occurred.

11. In a device of the class described, the

combination of a cylinder; a revoluble piston eccentrically mounted therein and provided with a chamber extending to its periphery; a revoluble ring in each side wall 0 said cylinder and concentric therewith;

and a blade mounted thereon and positioned in said peripheral chamber in said piston.

12. 'In a device of the class described, the

combination of a cylinder; a revoluble piston eccentricall mounted therein and provided with a clamber extendin to its peri he a revoluble ring in eac' side wall 0 sai cylinder and concentric therewith; a blade mounted thereon" and ositioned in said-peripheral chamber in sai iston; and means between said ring and bla e for forcing the outer end of the latter into contact with the. cylindrical wall of said cylinder.

13. In a device of the class described, the combination of a cylinder; a revoluble piston eccentricall mounted therein and provided with a 'c amber extending to its periphery; a revoluble ring in each side wall a blade mounted thereon and ositioned in said fipheral chamber insai piston; side h hp 7 on said blade provided with overin extensions in a groove in' the outer en of said blade; and means for forcing said side members into contact with the side walls of said cylinder.

14. In a device of the class described, the combination of a cylinder; a. revoluble piston eccentrically "mountedtherein and provided with a: ripheral chamber a portion of .the walls 0 which are cylindrical; oscillating members therein; a blade mounted between said oscillating members; means for forcing said blade outward1y;and revoluble rings embedded in annular grooves in the side walls of the cylinder and concentric therewith having projections thereon forming a support 0 blade. v Signed by me at 4 Post Ollice Sq., Boston,

Mass.,this 15th da of Jul 1909.

V H RBER I. WILBER. "Witnesses: ,WAL'rna E. Lomsann,

- NATHAN G. LOMBARD.

r the inner end of said said cylinder and 'concentrictherewith; 

